| Project/Area Number |
26620165
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Organic and hybrid materials
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
Hirata Shuzo 東京工業大学, 物質理工学院, 助教 (20552227)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | Delayed fluorescence / TADF / CPL / Chirality / OLED / EL display / Display / Contrast / 熱活性化遅延蛍光 / 円偏光発光 / 2色性因子 / 非対称性因子 / 有機EL / 電界発光 / エレクトロルミネッセンス / g値 / 円二色性 / 蛍光量子収率 / 光学活性 / 量子科学計算 |
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| Outline of Final Research Achievements |
Three kinds of metal-free aromatic compounds (CPDF1-3) with a chiral carbon sandwiched between a donor moiety and an acceptor moiety were designed. They showed thermally activated delayed fluorescence (TADF) as well as circularly polarized luminescence (CPL) characteristics. (R)-CPDF3 and (S)-CPDF3 showed CPL with a dissymmetry factor of 4×10-4 in toluene solution. CPDF3 doped into π-conjugated host with large energy of the lowest triplet excited state displayed a photoluminescence quantum yield of 99%. An electroluminescence (EL) device having a 30 wt% CPDF3 doped π-conjugated host as an emitting layer showed an external EL quantum yield of 9.5%. With increasing the concentration of (R)-CPDF3 and (S)-CPDF3 in the emitting layer, intermolecular charge transfer transition largely contributed to TADF, causing a disappearance of CPL characteristics from the devices.
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